常见的青紫型先天性心脏病是
A．室间隔缺损B．房间隔缺损C．动脉导管未闭D．法洛四联症E．动脉瓣狭窄
参考答案：D
— ＿＿ Betty this morning?
— Not yet, but she is sure to be here before noon.
A．Have you seen
B．Will you see
C．Do you see
D．Did you see
全国公用应急宽带VSAT网的技术体制采用（）方式。
A.TDMA/DAMA
B.FDMA/DAMA
C.FDMA/SCPC
D.FDM/DAMA
